<?php
class ClassName {
  
  public $foo=1;
  public $bar=2;
  public $baz=3;
  
  function __construct() {
    //
  }
}

$x = new ClassName;
echo "Array: ". var_export(is_array($x), 1)."\n";
echo "instanceof Traversable: ". var_export($x instanceof Traversable, 1)."\n";
echo "instanceof Iterator: ". var_export($x instanceof Iterator, 1)."\n";
echo "instanceof IteratorAggregate: ". var_export($x instanceof IteratorAggregate, 1)."\n";

foreach ($x as $key => $val) {
  echo "$key: $val\n";
}


?>

Array: false
instanceof Traversable: false
instanceof Iterator: false
instanceof IteratorAggregate: false
foo: 1
bar: 2
baz: 3